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Title: Excess nitrate in the East China Sea
Authors: G.T.F. Wong;G-C. Gong;K-K. Liu;S-C. Pai
Contributors: 國立臺灣海洋大學:海洋環境化學與生態研究所
Keywords: East China Sea;nutrients;Changjiang;Kurishio
Date: 1998-03
Issue Date: 2017-02-24T08:29:40Z
Publisher: Estuarine, Coastal and Shelf Science
Abstract: Abstract
‘ Excess nitrate ’ was found in waters with salinities below 30·5 in the top 10–15 m of waters covering one-third to one-half of the East China Sea in the summer of 1992. In these waters, significant concentrations of [nitrate+nitrite], up to about 6 μM, could be found while the corresponding concentrations of phosphate remained at or below 0·07 μM. Thus, the ratio of [nitrate+nitrite] to phosphate in these waters was far in excess of that at which these two essential nutrients are utilized by marine phytoplankton. (‘ Excess nitrate ’ is the concentration of [nitrate+nitrite] in excess of that which may be utilized by marine phytoplankton at the observed concentration of phosphate.) As a result, in contrast to the open marine systems in general, primary production in a significant portion of the East China Sea may be phosphate-limiting rather than nitrogen-limiting. The area covered by this layer of combined nitrogen-rich water could be temporally variable. While no ‘ excess nitrate ’ was detected in the south-eastern East China Sea along the Chinese coasts in the summer of 1992, significant quantities of ‘ excess nitrate ’, up to 4 μM, were found at the same location in the early spring of 1993 in waters with salinities as high as 34·5.
Relation: 46(3), pp.411-418
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41521
Appears in Collections:[海洋環境與生態研究所] 期刊論文

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